Larvas are small worm like creatures hatched from eggs laid by Queens. There are 2 different forms, the zombie larvas and the mutant larvas.
The zombie larva is a centipod like creature with a long cilinder body. It has 10 feet to crawl further and moves pretty fast. With it's 6 eyes it can keep track on both its surroundings and its prey.
The zombie larva enters the body through all possible holes, once inside it will make its way to the brain and releases a liquid that paralyzes everything. Once the victim is paralyzed the larva will detach the brain from the nerve system and control the body. It will use its host to attack all non-infected individuals it sees. If the host is too damaged the larva leaves the body.